Porter, M. E. (1990). The competitive advantage of nations. New York: Free Press.
Chicago Style CitationPorter, Michael E. The Competitive Advantage of Nations. New York: Free Press, 1990.
Cita MLAPorter, Michael E. The Competitive Advantage of Nations. New York: Free Press, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.